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The tweet marks an extraordinary development in the ongoing feud between Trump and the intelligence agencies investigating alleged ties between his campaign and Russia.

On Thursday, Trump told NBC News that he was frustrated by the ongoing investigation and believed it was motivated by Democrats' fury at losing the election.

Trump told NBC's Lester Holt: "And in fact when I decided to just do it, I said to myself, I said 'you know, this Russia thing with Trump and Russia is a made-up story, it's an excuse by the Democrats for having lost an election that they should have won'."

Earlier on Friday, Trump said his busy schedule makes it "not possible" for his staff to speak at the podium with "perfect accuracy."

The President then tweeted that fired FBI Director James Comey "better hope that there are no 'tapes'" of their conversations.

"As a very active President with lots of things happening, it is not possible for my surrogates to stand at podium with perfect accuracy!....," he wrote. "Maybe the best thing to do would be to cancel all future 'press briefings' and hand out written responses for the sake of accuracy???"

Trump defended the struggle by his administration to come up with a consistent timeline and rationale for the abrupt firing of FBI Director James Comey this week.

The president's advisers said Trump fired Comey in response to a recommendation by Deputy Attorney General Rod Rosenstein, then said Trump had planned to fire Comey regardless.